interop: don't allocate for Functions and Notifications in New

Functions are usually immediately replaced (and it's OK for them to be nil,
searching through an array with length of zero is fine), Notifications are
usually appended to (and are absolutely useless in verification contexts).

pkg/core/interop/context.go

@@ -57,23 +57,19 @@ func NewContext(trigger trigger.Type, bc blockchainer.Blockchainer, d dao.DAO,
 	block *block.Block, tx *transaction.Transaction, log *zap.Logger) *Context {
 	baseExecFee := int64(DefaultBaseExecFee)
 	dao := d.GetWrapped()
-	nes := make([]state.NotificationEvent, 0)
 
 	if bc != nil && (block == nil || block.Index != 0) {
 		baseExecFee = bc.GetPolicer().GetBaseExecFee()
 	}
 	return &Context{
-		Chain:         bc,
-		Network:       uint32(bc.GetConfig().Magic),
-		Natives:       natives,
-		Trigger:       trigger,
-		Block:         block,
-		Tx:            tx,
-		DAO:           dao,
-		Notifications: nes,
-		Log:           log,
-		// Functions is a slice of interops sorted by ID.
-		Functions:   []Function{},
+		Chain:       bc,
+		Network:     uint32(bc.GetConfig().Magic),
+		Natives:     natives,
+		Trigger:     trigger,
+		Block:       block,
+		Tx:          tx,
+		DAO:         dao,
+		Log:         log,
 		getContract: getContract,
 		baseExecFee: baseExecFee,
 	}